521212555044 has 72 divisors (see below), whose sum is σ = 1358509658688. Its totient is φ = 168368328000.

The previous prime is 521212555021. The next prime is 521212555147. The reversal of 521212555044 is 440555212125.

521212555044 is a `hidden beast` number, since 5 + 2 + 121 + 25 + 5 + 504 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 445152 + ... + 1113815.

It is an arithmetic number, because the mean of its divisors is an integer number (18868189704).

Almost surely, 2^521212555044 is an apocalyptic number.

It is an amenable number.

521212555044 is an abundant number, since it is smaller than the sum of its proper divisors (837297103644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521212555044 is a wasteful number, since it uses less digits than its factorization.

521212555044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559265 (or 1559260 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

Adding to 521212555044 its reverse (440555212125), we get a palindrome (961767767169).

The spelling of 521212555044 in words is "five hundred twenty-one billion, two hundred twelve million, five hundred fifty-five thousand, forty-four".